Related by context. All words. (Click for frequent words.) 76 reverse circulation 76 Reverse Circulation 74 aircore drilling 73 RC drilling 72 RC drill 72 infill diamond 72 infill drill 72 auger drill 71 diamond drillholes 71 drillholes totaling 71 RAB drilling 71 diamond drilling 71 aircore 71 RC percussion 71 Reverse Circulation drilling 70 excavator trenching 70 NQ diamond 70 diamond drill 70 trenching sampling 69 delineation drill 69 aircore drill 69 Reverse Circulation drill 69 TSX VENTURE RVS FRANKFURT 68 geological mapping trenching 68 Kavola East 68 drill holes 68 Reverse circulation 68 intersected sulphide mineralization 68 geochemical sampling 68 geochemical soil 67 mapping prospecting 67 aircore holes 67 Geophysical surveys 67 geological mapping prospecting 67 prospecting mapping 67 NQ diamond drill 67 Takom Zone 67 excavator trenches 67 Diamond Drill 67 MPD# 67 Diamond Drilling 67 WDC# 67 auger drilling 67 Marban deposit 67 RC drillholes 66 holes #WR# 66 Nueva Caledonia 66 drillholes 66 Kau# 66 surface geochemical sampling 66 Pokukrom East 66 Tantamaco 66 Assay Results 66 surface trenching 66 Carotare 66 NQ diamond drilling 66 Forestel Zone 66 infill holes 66 outcrop sampling 66 Pokukrom West 66 SADD# 66 reconnaissance prospecting 66 intersected kimberlite 65 soil geochemical sampling 65 Geological mapping 65 trenching mapping 65 hole HR# 65 Zafranal 65 Veta Minitas 65 Isambara 65 induced polarization IP 65 diamond drillhole 65 3RV 65 mechanized trenching 65 adit sampling 65 auger sampling 65 Calandria Sur 65 mechanical trenching 65 #m@#.#g t gold [001] 65 Dombraly 65 ground geophysical surveys 65 #m@#.# g t Au [002] 65 Yaramoko 65 induced polarization 65 Drilling Extends 65 Significant intercepts 64 Calandria Norte 64 Detailed geological mapping 64 Tres Juanes 64 Butia prospect 64 ground geophysical surveying 64 Klaza property 64 Zone Bambadinka 64 #m@#.#g t gold [002] 64 Aircore drilling 64 #m@#.# g t [002] 64 #TR# 64 Significant assay 64 Fayolle Project 64 trench sampling 64 #WR# 64 geochemical surveying 64 IP geophysical 64 Cu Ni 64 #m@#.#g t Au [001] 64 IP Resistivity survey 64 Induced Polarization IP 64 Lone Pine Property 64 infill drilling 64 Buriti trend 64 ground geophysics trenching 64 Las Boquillas 64 IP geophysical surveys 64 Jumping Josephine 64 Significant intersections 64 resource delineation drilling 64 El Cometa 64 Letitna 64 Fobiri 64 Ground geophysical surveys 64 Riscos de Oro 64 lateral extensions 64 infill drillholes 64 Roxgold 64 Surface sampling 64 airborne geophysics 64 #CBN 64 Takom 64 Preliminary metallurgical 64 hole RC# 64 Gold Intersected 63 geological mapping sampling 63 Juanicipio Vein 63 Bajo Negro 63 Golouma South 63 Kuriskova 63 Exploration Drilling 63 mapping trenching 63 infill RC 63 Drilling Commences 63 holes drilled 63 Dubenski Shaft Zone 63 Mato Velho 63 induced polarization geophysical surveys 63 geophysical geochemical 63 Cerro la Paila 63 geophysical surveying 63 IP resistivity 63 Rare Earth Element REE 63 Marban Block 63 Ciresata Porphyry 63 #m@#.#g t Au [003] 63 Diamond Drill Holes 63 averaging #.#g t [001] 63 Guayabito 63 soil geochemical surveys 63 Drill Hole Results 63 Valle Hondo 63 Ntaka Hill 63 TSX VENTURE SGX 63 Sidace Lake 63 Aguila Cu Mo 63 metallurgical testwork 63 Pucamayo 63 El Compas 63 geochemical surveys 63 Penasco Quemado 63 Zuun Mod molybdenum 63 resource delineation 63 DDH# [001] 63 Somituri Project 63 delineation drilling 63 Tortigny 63 coincident geophysical 63 drill hole SADD# 63 mineralized zones intersected 63 Chiis 63 stepout drilling 63 Reverse Circulation Drill 63 IP Induced Polarization 63 Gwabe 63 Oshiveli 62 HLEM 62 PdA Extension 62 Langmuir Nickel Discovery 62 extensional drilling 62 #SH# 62 soil geochemistry 62 ground magnetics 62 intersecting mineralization 62 airborne EM 62 stream sediment 62 BCGE# 62 intersected mineralized 62 Ni Cu PGM 62 VVGD 62 Bajo Negro vein 62 Cobrecon 62 Marta Este 62 #m@#.# g t Au [001] 62 hole MWNE 62 Drilling Encounters 62 uranium mineralization intersected 62 Schefferville Gold 62 Muirs Reef 62 Urumalqui 62 Expands Mineralization 62 Haquira Project 62 lithogeochemical 62 NQ drill 62 Sesmo Sur 62 airborne geophysical anomalies 62 coreholes 62 intersected mineralized zones 62 Promontorio 62 Real Viejo 62 TerraX 62 Commences Drill Program 62 Kelex 62 mapping geochemical sampling 62 mechanized auger 62 Announces Assay Results 62 Pasacancha Ag Au 62 Geophysical Survey 62 Tuligtic 62 Anuri kimberlite 62 DDHs 62 Eaglehead Property 62 Assay results 62 Sicera Sur 62 Drilling Confirms 62 Nfante West 62 Timmins Porcupine West 62 prospecting geological mapping 62 Arap Tepe 62 Central Mineralised Zone 62 aircore drill holes 62 hole LL# 62 Drilling Resumes 62 Ngayu 62 ground geophysics 62 Pan de Azucar 62 Cumpie Hill 62 El Quevar project 62 soil geochemical survey 62 induced polarization surveys 62 TSX ORE 62 DEBD 62 Reverse Circulation Drilling 62 holes RR# 62 magnetometric 62 Kangaluwi 62 geologic mapping 62 Bonanza Ledge Zone 62 Energold Drilling Corp. 62 Kenge Target 62 NQ diameter 62 downhole geophysics 62 airborne geophysical surveying 62 Ouro Roxo 62 geochem 62 geophysical targets 62 Mala Noche Footwall Zone 62 Homestake Silver 62 Drilling Underway 62 underground delineation drilling 62 IP geophysics 62 Mobilizes Drill 62 intersected silicified 62 Silver Mineralization 62 Encino Vein 62 geochemical geophysical 62 #m@#.#g t Au [006] 62 microdiamond results 62 airborne radiometric 61 induced polarization anomalies 61 detailed geological mapping 61 Lac Herbin mine 61 Magambazi 61 bulk sampling 61 VTEM airborne surveys 61 downdip extension 61 @ #.#g t [002] 61 radiometric surveys 61 Cheowa 61 soil geochemical 61 Snowfield Zone 61 Nueva Concepcion 61 detailed geologic mapping 61 Mineralized intercepts 61 Airborne geophysics 61 Asmara Project 61 Kanosak 61 Meliadine West 61 Surface trenching 61 geophysical surveys 61 Santa Pancha 61 Meter Drill 61 -Expandable Memory 61 aeromagnetic survey 61 Early Joli Fou 61 Las Naves 61 Minapampa Zone 61 CNSX RXE 61 Initial Resource Estimate 61 Kenge 61 Cu Au 61 airborne electromagnetic 61 Las Tres Palmas 61 Minera Afrodita 61 geochemical assay 61 metres@#.# g t [003] 61 Kerekounda 61 #-# compliant resource 61 #-# compliant mineral 61 Paboase South 61 Gongondy 61 massive sulphide intersections 61 #.#g t gold [005] 61 #.#gpt [001] 61 electromagnetic conductors 61 Colnic 61 Hotish 61 Dioulafoundou 61 Azulitas 61 Gramalote Ridge 61 Goldrea 61 Ag Pb Zn 61 Manfo Property 61 Monterde Project 61 intersected massive sulphide 61 CANALASKA URANIUM LTD 61 Barkerville Mountain 61 Angela Vein 61 Bejucosa 61 Drilling Intersects 61 geophysical interpretation 61 Handcamp 61 bulldozer trenching 61 Shirotnaia 61 KRC# [001] 61 induced polarization survey 61 Marta Norte 61 Kay Tanda 61 VTEM surveys 61 hole GF# 61 potentially bulk mineable 61 Skarn Zone 61 DDH #B 61 IP geophysical surveying 61 backhoe trenching 61 Induced Polarization Survey 61 Eastford Lake 61 VTEM airborne 61 meters@#.# g t [002] 61 Infill Drilling 61 AeroTEM III 61 Onkelo 61 Ciresata 61 m@#.# g t [003] 61 geochemical samples 61 Medrizien 61 holes DDH 61 hole #GSE# 61 SLD# 61 Nkwanta Concession 61 Coneto 61 Nfante East 61 Cu Pb Zn Ag 61 Itigi Manyoni Uranium 61 airborne magnetic survey 61 UTEM 61 mineralized intercepts 61 Kenwest 61 La Yaqui 61 #RB# 61 Geochemical sampling 61 Tassawini 61 Naciente Quebrada Pedregosa 61 drilled vertically 61 Otish Uranium 61 Big Daddy Chromite 61 Adumbi Prospect 61 Gramalote 61 Antimony Mountain 61 Mineralized intervals 61 Yarumalito 61 Dadiangou 61 Reports Assay Results 61 intersected anomalous radioactivity 61 section #N [002] 61 Segala Main 61 #m@#.# g t Au [006] 61 hole LA# 61 Yanfolila 61 airborne magnetometer 61 magnetometer survey 61 La Morocha 61 Brucejack Project 61 Aircore 60 Puma Exploration 60 geological reconnaissance 60 Assay Results From 60 stope delineation 60 Kavola 60 Deerhorn Zone 60 Induced Polarization surveys 60 hole NR# 60 Cu Zn Ag 60 Mankarga 5 60 Langmuir Project located 60 linecutting 60 Beruang Kanan 60 Carscallen Gold 60 Mineralized Zone 60 Njame 60 Pasacancha Hole 60 Renard cluster 60 surface outcrops 60 airborne geophysical survey 60 Nakru 60 Quantec Titan 60 MMI soil geochemical 60 Epithermal Gold 60 #m@#.#g t [002] 60 JORC Code compliant 60 Upper Bracemac 60 Singida Londoni gold 60 Los Candelones 60 Wasamac property 60 Clay Howells 60 Infill Drilling Program 60 VTEM survey 60 Culebrilla 60 stream sediment geochemical 60 HQ diameter 60 Drill Holes 60 geological mapping geochemistry 60 DDD# 60 Tumpangpitu 60 Curipamba 60 Inmaculada Project 60 Koshaj 60 drillhole 60 Abel Knoll 60 Golouma West 60 reconnaissance geological mapping 60 Ground geophysics 60 metres@#.#g t gold 60 Tres Juanes Norte 60 Emba Derho 60 IOCG targets 60 Hatter Graben 60 Lac Herbin 60 DDH IAX 60 IP induced polarization 60 Aurizona Main 60 airborne VTEM 60 Diamond Drill Hole 60 Akasaba 60 QG1 60 Detailed mapping 60 Ouro Verde Deposit 60 Lang Exploratory Drilling 60 Delineation Drilling 60 prospecting trenching 60 gravity geophysical surveys 60 Dogpaw No. 60 Cu Zn 60 Resumes Drilling 60 Lamaque Property 60 intersected massive sulphides 60 Malrok 60 holes IKD 60 soil sampling 60 maiden JORC resource 60 Vargbacken 60 Kobada Mali 60 Drilling Completed 60 trenching 60 geophysical surveys trenching 60 Copper Mineralization 60 stepout 60 NQ sized 60 Tassawini Guyana 60 Mongora 60 intersected #.#m [002] 60 drillcore 60 previously unsampled 60 TSX VENTURE PTU 60 Ciresata deposit 60 Bonanza Ledge 60 Ancash Peru 60 airborne geophysical surveys 60 gradient array 60 Infill drilling 60 MGZD# [001] 60 Nordeau East 60 radiometric survey 60 TSX VENTURE SBW 60 NE Wollaston 60 Webbs Silver 60 Soil sampling 60 microdiamonds 60 Las Calandrias 60 Hondo Valle 60 Bellechasse Timmins 60 Roughrider East 60 borehole geophysics 60 LC#C 60 Amends Private Placement 60 Chester Copper Polymetallic 60 Paiol 60 Grota Seca 60 TSX VENTURE BTR FRANKFURT 60 Metallurgical Testing 60 Au Cu Ag 60 Mistassini property 60 Bellekeno 60 EM conductors 60 NSGold 60 TSX AQA FRANKFURT 60 Grayd Resource Corporation 60 Cordero Porphyry 60 TSX VENTURE CDB PINK 60 Skukum 60 IP chargeability anomalies 60 Nithi Mountain 60 Calicanto 60 #m@#.# g t Au [003] 60 TiTac 60 borehole geophysical 60 ZTEM survey 60 La Dura 60 Las Carolinas 60 Commences Drilling Program 60 Pantanillo 60 outcropping mineralization 60 #m@#.#g t Au [005] 60 Sleeping Giant Zone 60 ICE# [002] 60 element ICP analysis 60 Molybdenum Mineralization 60 Argentex polymetallic discovery 60 Geologic mapping 60 Molybdenum Copper 60 BB# [002] 60 #.#gpt gold [001] 60 Kunche 60 Itilima 60 Porphyry Pearl 59 Drill Program 59 Tiriganiaq deposit 59 Amax Exploration 59 mineralization intersected 59 mineralization encountered 59 Ruhuhu 59 sheeted quartz 59 WDD# 59 Bulk sampling 59 Hambok 59 Quebrada Verde 59 Bellechasse Timmins deposit 59 Zam Zam Shenkman 59 Skukum Creek 59 Taunus pit 59 kimberlitic material 59 holes BR# 59 radiometrics 59 Sunbeam Pettigrew property 59 airborne electromagnetic survey 59 #m@#.#g t Au [004] 59 Porphyry Copper 59 Corcoesto 59 Woodjam North 59 meter spacing 59 caustic fusion diamond 59 LURC# 59 Drilling Continues 59 meters downhole depth 59 Fry Inlet 59 Preliminary metallurgical testwork 59 3D Induced Polarization 59 #.#m grading #.#g [001] 59 Mankarga Zone 59 TSX VENTURE FV FRANKFURT 59 Douay Ouest 59 Guayabales 59 hole MJV 59 Drill intersections 59 geological modeling 59 TSX VENTURE YEL FRANKFURT 59 ground radiometric surveying 59 sampling trenching 59 geological mapping geochemical 59 VTEM 59 Dogpaw Lake property 59 Constancia Copper Molybdenum 59 Magusi deposit 59 Batoto 59 MMI geochemistry 59 Grandroy 59 Guajes West 59 averaging #.#g t [002] 59 Batero 59 Goldpines North 59 Niakafiri Southeast 59 quartz ankerite 59 #.#g t gold [001] 59 Pulacayo 59 Bisha Main 59 Cuiu Cuiu 59 Gupo Gold 59 Valdecanas Vein 59 geophysical conductors 59 resource estimation 59 hole ZFRC# 59 Drillholes 59 Dogpaw Lake 59 Nyota Prospect 59 Yaragua 59 Lemarchant Prospect 59 Nickel Offsets 59 La Mascota zone 59 kimberlite outcrop 59 sulphide zones 59 magnetometer surveys 59 Drill Results 59 radiometric logging 59 Cerro Maricunga 59 Breccia Zone 59 Ogama Rockland 59 airborne geophysical 59 Grams Per Tonne 59 Geotech Ltd 59 TSX VENTURE MMI 59 Hugla Tepe 59 ground radiometric surveys 59 updated Mineral Resource 59 VLF EM survey 59 BHEM 59 #m@#.#g t [006] 59 Ixtaca Zone 59 Airborne Geophysical Survey 59 La Josefina 59 CSAMT 59 Handeni Gold Trend 59 Niakafiri 59 Cu Au Ag 59 SMI LX 59 El Creston molybdenum 59 Cantarranas 59 mineralized drill intercepts 59 Initiates Drilling 59 LJ#r 59 Tanjianshan 59 South Miwah Bluff 59 TSX PEZ OTCBB 59 Starts Drilling 59 Soquem 59 kimberlite dykes 59 inferred resource estimate 59 Fermont Iron Property 59 Whabouchi 59 ZFDDH# 59 Whabouchi property 59 IP resistivity survey 59 TSX VENTURE VMS 59 massive sulphide horizon 59 El Orito vein 59 geological mapping 59 g t Pt 59 preliminary metallurgical testwork 59 geological geochemical 59 Definition Drilling 59 REE mineralized 59 section #E [003] 59 Airborne Survey 59 Los Helados 59 Metres Averaging 59 previously undrilled 59 Simuku 59 metres@#.# % [002] 59 Snowfield Project 59 Soil Anomaly 59 Lac Pelletier 59 mineralized skarn 59 Accori North 59 Hole RR# 59 Malartic Lakeshore property 59 Silica Ridge 59 Mankarga 59 Au Cu 59 systematic geochemical sampling 59 #m@#.# % [003] 59 airborne anomalies 59 Lac Pivert Rose 59 Lac Levac property 59 Workman Bench 59 Santa Eduviges 59 open pitable 59 Presidente Terra 59 stream sediment geochemistry 59 #m@#.# g t Au [005] 59 Uzboy 59 Porphyry Copper Gold 59 COGITORE Resources Inc. 59 Porphyry Project 59 Kutcho 59 Condor de Oro 59 BLEG sampling 59 Laterite 59 corehole 59 Hypogene 59 Hadal Awatib 59 #m@#.#g t [003] 59 metres@#.# g t Au [002] 59 Ormsby Zone 59 Induced Polarisation IP 59 HG Sulphide zone 59 JORC resource estimate 59 Goldcreek Property 59 hole NAD# 59 VLF surveys 59 mineralized zone 59 Company OTCBB GNMT 59 TSX LAM 59 BERLIN ABI 59 #m@#.# g t [004] 59 OTD# 59 Segala deposit 59 Hurdman Property 59 coincident geochemical 59 + Pd + 59 detailed airborne magnetic 59 Stockwork 59 enzyme leach 59 Agbaou 59 drilled thicknesses 59 geochemical anomalies 59 electromagnetic geophysical 59 Strike Length 59 Cebada mine 59 Ayelen Vein 59 VTEM anomalies 59 TSX VENTURE AQM BVLAC 59 Massive Sulphide 59 Northern Freegold 59 Paboase 59 Borate Hills Projects 59 GG6 59 Titiribi 58 Okohongo 58 soil sampling trenching 58 DUB# 58 Metallurgical testwork 58 VTEM airborne survey 58 soil geochemical anomalies 58 Ronguen gold 58 magnetite mineralization 58 TSX VENTURE MDW 58 Corachapi 58 Au Cu mineralization 58 metres@#.# g t Au [003] 58 Sian Praso 58 ft. perf 58 Yenac 58 Hushamu 58 Veta Norte 58 VTEM geophysical survey 58 coincident magnetic 58 #.#g t Ag [005] 58 MegaTEM 58 Epithermal 58 intersected mineralization 58 Bracemac Zone 58 Rojo Grande 58 Aradaib 58 TSX VENTURE NIB 58 Metre Drill Program 58 BHEM surveys 58 Firawa 58 infill sampling 58 holes RL# 58 Sipopok 58 gold copper porphyry 58 Tagpura 58 copper molybdenum gold 58 Bir Moghrein 58 Induced Polarization 58 Singida Gold Project 58 TSX VENTURE WOO 58 Tungsten Molybdenum 58 Harrier Underground 58 La Cantera prospect 58 anomalous mineralization 58 Upper Fir 58 Confirms Continuity 58 Vaca Muerta 58 intersected weakly mineralized 58 kimberlite float 58 Carotare deposit 58 El Domo deposit 58 Despoblados 58 South Minita 58 Frankfurt M1D 58 EM geophysical survey 58 TSX VENTURE GYD 58 Lac Levac 58 Targets Identified 58 geochem anomalies 58 sulphide intersections 58 Caracucho 58 Moly Brook 58 EM anomalies 58 Kiena mine 58 Matsitama Project 58 calcrete sampling 58 TSX VENTURE PUM 58 Hole PXE 58 Carheil 58 reconnaissance mapping 58 Delineation drilling 58 REN Property 58 Inter Citic Reports 58 Once Bocas 58 #.#g t [005] 58 Copper Equivalent 58 gold mineralization intersected 58 Volcanogenic Massive Sulphide VMS 58 Grade Mineralization 58 Extends Mineralization 58 WAT# #A 58 Taricori 58 GPGR 58 aplite dykes 58 hole FL# 58 Concurayoc 58 SGS Lakefield Laboratories 58 Uranium Mineralization 58 Linear Metals Corporation 58 Dory Pond 58 resistivity surveys 58 Plata diatreme 58 grade drill intercepts 58 copper mineralization intersected 58 Drilling Intercepts 58 m@#.# g t Au [002] 58 Lower Mannville 58 Transworld Laboratories 58 Bayfield Ventures 58 Murgor Resources 58 Private Placement Oversubscribed 58 mineralized intrusive 58 Cassiar Moly property 58 Fabie Bay 58 Ikungu 58 Upper Skarn Ridge 58 Luiri Hill 58 dipole dipole IP 58 Kaukua 58 ZK# [002] 58 Kasala Project 58 Haquira Cu Mo 58 Adi Nefas 58 Miwah Gold Zone 58 induced polarization geophysical 58 Tuvatu 58 HREO TREO 58 #m@#.# % [007] 58 TSX VENTURE SMR 58 Troymet 58 Aappaluttoq 58 Pinaya 58 Stepout 58 Don Ese 58 scheelite bearing 58 Bombore 58 geophysics prospecting 58 Explor Resources 58 #m@#.#g t [001] 58 Pasacancha 58 -ActivClient 58 Greenschist Zone 58 Nickel Offsets Property 58 NAD# [002] 58 ppm Ag 58 Dubenski 58 Agua Branca 58 NQN 58 #m@#.# % [004] 58 geophysical conductor 58 vertical stratigraphic 58 Ollachea Project 58 geochemically anomalous 58 Bulk Sampling 58 Gregory Isenor 58 KDH# [001] 58 East Acma 58 mineralized outcrops 58 JBP Linear 58 #m@#.# % [006] 58 Turnor Lake 58 Claim Blocks 58 hole BC# 58 drill intercepts 58 Koshaj Deposit 58 Tatajuba 58 El Cafetal La Virgen 58 sulfide bearing 58 Corp. Joins OTCQX 58 Veta Sur 58 Sisson Brook 58 Kena Property 58 TSX VENTURE MTO 58 El Domo 58 Marudi Mountain Gold 58 Polymetallic 58 basal till 58 TSX VENTURE MOR PINK 58 Kaniago 58 meters@#.# g t [001] 58 hole NC# 58 Western Porphyry Zone 58 tetraborate fusion 58 Canamerica 58 Triex Minerals Corporation 58 Bokan Dotson Ridge 58 Mt Penck 58 Geotech Ltd. 58 Sambaru 58 Trench TKB# 58 Regcourt 58 Sissingue 58 Scadding Gold 58 GPD# 58 spaced drill 58 Filo de Oro 58 Fayolle property 58 Tirex TSX VENTURE 58 BLEG 58 Rio Zarza 58 Cerro Pelon 58 mapping geochemistry 58 #g t Au [001] 58 g t Beryllium 58 variably mineralized 58 Ampliacion Pueblo Viejo 58 Magusi 58 RC Reverse Circulation 58 Cerro de Oro 58 Completes Airborne 58 TSX VENTURE BVG FRANKFURT 58 relogging 58 Palmarito Project 58 gAu t 58 PG# Zone 58 Luisha South 58 hole BR# 58 Droujba kimberlite pipe 58 Lipena 58 artisanal workings 58 trenching pitting 58 drillhole spacing 58 Gold Oxide Skarn 58 Vetas Gold 58 Seabee Deep 58 Estrella de Oro 58 Sicera Norte 58 uraniferous 58 Mara Rosa 58 Mineralized intersections 58 owned Minago sulphide 58 Perestroika Prospect 58 Kourouloulou 58 McPhar 58 Dubenski property 58 Cancor Mines Inc. 58 Creso Exploration Inc. 58 Inc. TSX ETG 58 Dienemera 58 magnetic geophysical 58 Megatem 58 downhole geophysical 58 QAP DDH 58 APV# [002] 58 Deli Jovan 58 Cannivan Gulch 58 Akasaba Mine 58 averaging #.#g t [003] 58 downhole EM 58 Bolobolo 57 drill hole HR# 57 geophysical survey 57 Kenge target 57 geophysics trenching 57 magnetic electromagnetic 57 #,# ft. perf 57 Lower Acacus Formation